How do I fix Wi-Fi not working on iPhone after switching to Xfinity internet?

“How do I fix Wi-Fi not working on iPhone after switching to Xfinity internet?: I had an internet change this morning. I cannot get Wi-Fi on my iphone but it shows the icon. Also get settings to click General. Anfo I get moves slowly I changed from ATT to Xfinity internet this morning. I cannot get Wi-Fi on my iphone in settings“

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Troubleshooting iPhone WiFi:

A. Restart your Modem and Router

Unplug the modem and router from the power outlet, and then power it back on.

B. Forget this Network:

Remove this network from your phone, and then add it back. If you do not own this router, but are rather leasing it from your new ISP, then you may be needing to add the network back. With DHCP being the protocol, you are assigned an IP address automatically, and you don’t have to assign it manually (static).

C. Disable Cellar:

Try disabling cellular, and then see if it works.